Building slab



Jan, 20, 1925.

F. LICHTENBER'G ET Al.

BUILDING SLAB Filed Aug. 1'7, 1923 llna INVENTOR /Tj'ed Zzchtenberg /Vwael BY 2 .(mfianATToRNEY Patented dan. 20, 1925.

UNITED STATES lll PATENT OFFICE.

FRED LICHTENBERG AND MICHAEL M. MCCARTHY, OF YONKERS, NEW YORK.

BUILDING SLAB.

Application filed August 17, 1923.

To @ZZ LU/wm t may concern.'

Be it known that we, FRED LioH'rENBmie and MICHAEL M. MCCARTHY, citizens of the United StL tes, and residents of Yonkers, ldestchester County, and State of New York, have invented certain new and useful Improvements in Building Slabs, of which the following is a specification.

Special objects of this invention are to provide a reinforcement for concrete building slabs which can be readily made up from ordinary wire to suit any size of slab or block; which will impart to the slab the desired strength and durability and which further, will provide an effective means of bonding adjacent slabs in a wall structure or the like.

These and other objects are attained in the embodiment of the invention illustrated in the accompanying drawing, wherein:

Figure l is a perspective and part sectional View of a form of wall slab having features of the invention incorporated therein.

Figure 2 is a similar view on a smaller scale, illustrating the slabs built up into a wall structure.

Figures 3 and 4L are broken face views of two different forms of the slabs.

Figure 5 is a plan and part sectional view of the reinforcement or basket structure.

rlhc body of the reinforcement is in the nature of a helix, so that it can be wound from a single wire, in a series of loops eX- tending continuously substantially from one end to the other of the slab. ln Figure l the first loop 7 is closed upon itself and made fast as by means of a wire wrapping S, and from this closed loop the wire is inclined as at 9, down to the level of the next loop, the end of which, at 10, is long enough to project beyond the edge of the finished slab. An inclined length of wire 11 extends from this projected loop back to and beyond vthe opposite edge of the slab to form a projecting loop l2 at this edge. The winding is continued in this fashion for substantially the full length of the slab so that the slab, which is designated generally by the reference character 13, has the loops l() and 12 projecting from the oppositeedges thereof.

The coils of the so-called helical winding are usually flattened, as indicated, to conform generally to the cross sectional outline of the slab and the convolutiogs are Serial No. 657,837.

made so as to bring the projecting loops into staggered relation at opposite edges of the slab, as in Figures l, 2 and 3, or directly opposite as in Figure 4e'.

Longitudinal reinforcen'ients ltare shown as extending substantially the full length of the slab. These reinforcements also may be of wire, and may be interwoven over and under the inclined side wires of the helical winding, as indicated at 15.

lf desired, the continuous helical winding may be interwoven over and under the longitudinal wires, substantially as indicated in Figure 5, the result in both cases being the two layers of reinforcing fabric standing in spaced relation near the opposite faces of the slab.

To fasten the two reinforcing layers in this spaced relation, ties 16 may be provided at intervals, the same being shown in the form of short tie wires, having their ends caught about the longitudinal or helical reiilifprcing wires at the opposite sides of the s a rlhe reinforcement disclosed has the important advantage that it may be produced in the main by machinery, the loops being wound as a continuous coil over a mandrel, and the longitudinal wires and ties being applied either before or after removal of the winding from the mandrel.

The projecting loops at the opposite edges of the slabs aid in the handling of the iinished slabs, protect the slabs from injury and provide, in the finished wall, overlapping reinforcements at the bonds 17 between adjoining slabs. In building up the wall the slabs may be setl so as to take advantage of the reinforcement afforded by completely overlapping the bonding loops, or where the reinforcement is not so necessary, the slabs may be separated further and the overlapping be reduced to that extent, or in fact, be entirely eliminated.

What we claim is:

1. A concrete building slab having a flattened helical reinforcement embedded therein with loops projecting from opposite edges of the slab, longitudinal reinforcements interwoven with the coils and ties connect-ing opposite sides of the flattened helical coils.

2. concrete building slab having a flattened helical reinforcement embedded therei n with loops of the same projecting from the opposite edges or" the slab and longitudinal reinforcements interwoven back and forth to opposite sides of the ooilsof the Continuous reinforcement and embedded in the slab to brace the slab against longitudinal stress.

3. 'Aconcrete building slab having a attened helical reinforcement embeddedutherein with loops of the sazne projecting` from the opposite edges of the slab and longitndi` nal reinforcements interwoven with `the coils or' `the continuons reinforcement to brace the slab against longitudinal stress and ties engaged with the longitudinal reinforcements.

4L. A concretebuilding slab havingl a Hattened` helical reinforcement embedded therein with the opposite sides or' The coils spaced apart to lie adjacentthe opposite faces of the slab and ties for holding the sides of the coils thus spaced.

In witness whereof, We have hereunto sei; our hands this 30th day of June, 1923.

FRED LICIITENBERG. MICLHA EL M. MCA RFPVY; 

